Solid-State Crystallization Behavior of Tetrabenzoporphyrin Organic Semiconductors

2011 ◽  
Vol 44 (2) ◽  
pp. 98-104
Author(s):  
Naoki Noguchi ◽  
Haruki Asatani ◽  
Masakuni Matsuoka
Keyword(s):  
Solid State ◽  
Organic Semiconductors ◽  
Crystallization Behavior

scholarly journals Mesomorphic Behavior in Silver(I) N-(4-Pyridyl) Benzamide with Aromatic π–π Stacking Counterions

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1666 ◽  
Author(s):  
Issac Torres ◽  
Mauro Ruiz ◽  
Hung Phan ◽  
Noemi Dominguez ◽  
Jacobo Garcia ◽  
...  
Keyword(s):  
Solid State ◽  
Organic Semiconductors ◽  
Flexible Electronics ◽  
Crystalline Solid ◽  
Naval Research ◽  
Scanning Calorimetry ◽  
New Family ◽  
Π Stacking ◽  
Capable Groups ◽  
New Generation

Organic semiconductor materials composed of π–π stacking aromatic compounds have been under intense investigation for their potential uses in flexible electronics and other advanced technologies. Herein we report a new family of seven π–π stacking compounds of silver(I) bis-N-(4-pyridyl) benzamide with varying counterions, namely [Ag(NPBA)2]X, where NPBA is N-(4-pyridyl) benzamine, X = NO3− (1), ClO4− (2), CF3SO3− (3), PF6− (4), BF4− (5), CH3PhSO3− (6), and PhSO3− (7), which form extended π−π stacking networks in one-dimensional (1D), 2D and 3D directions in the crystalline solid-state via the phenyl moiety, with average inter-ring distances of 3.823 Å. Interestingly, the counterions that contain π–π stacking-capable groups, such as in 6 and 7, can induce the formation of mesomorphic phases at 130 °C in dimethylformamide (DMF), and can generate highly branched networks at the mesoscale. Atomic force microscopy studies showed that 2D interconnected fibers form right after nucleation, and they extend from ~30 nm in diameter grow to reach the micron scale, which suggests that it may be possible to stop the process in order to obtain nanofibers. Differential scanning calorimetry studies showed no remarkable thermal behavior in the complexes in the solid state, which suggests that the mesomorphic phases originate from the mechanisms that occur in the DMF solution at high temperatures. An all-electron level simulation of the band gaps using NRLMOL (Naval Research Laboratory Molecular Research Library) on the crystals gave 3.25 eV for (1), 3.68 eV for (2), 1.48 eV for (3), 5.08 eV for (4), 1.53 eV for (5), and 3.55 eV for (6). Mesomorphic behavior in materials containing π–π stacking aromatic interactions that also exhibit low-band gap properties may pave the way to a new generation of highly branched organic semiconductors.

scholarly journals Structural insights into Lewis acid and F4TCNQ doped conjugated polymers by solid-state magnetic resonance spectroscopy

2022 ◽  
Author(s):  
Alana Dixon ◽  
Herve Vezin ◽  
Thuc-Quyen Nguyen ◽  
G. N. Manjunatha Reddy
Keyword(s):  
Solid State ◽  
Magnetic Resonance ◽  
Conjugated Polymers ◽  
Organic Semiconductors ◽  
Carrier Mobility ◽  
Molecular Level ◽  
Charge Carrier Mobility ◽  
Resonance Spectroscopy ◽  
Molecular Doping ◽  
Structural Insights

Molecular doping strategies facilitate orders of magnitudes enhancements in the charge carrier mobility of organic semiconductors (OSCs). Understanding the mechanisms of different doping strategies for OSCs and molecular-level constraints on...

Synthesis, characterization and solid state conductivity of nano-size ionic Schiff base polymers of Cu2+, Zn2+ and VO2+ containing viologen moieties

2019 ◽  
Vol 43 (42) ◽  
pp. 16468-16477
Author(s):  
Zohreh S. Ghavami ◽  
Gholamhossein Grivani
Keyword(s):  
Schiff Base ◽  
Solid State ◽  
Organic Semiconductors ◽  
Schiff Base Ligand ◽  
Conductivity Measurements ◽  
Schiff Base Polymers ◽  
Nano Size

The new nano size ionic metallo-Schiff base polymers (IMSPs) were synthesized by reaction of Schiff base ligand of L and VO (acac)2, ZnCl2 and CuCl2. The solid state conductivity measurements candidate them as new metallo-organic semiconductors.

Sensitivity boosting in solid-state NMR of thin organic semiconductors by a paramagnetic dopant of copper phthalocyanine

2013 ◽  
Vol 556 ◽  
pp. 195-199 ◽  
Author(s):  
Yusuke Nishiyama ◽  
Tatsuya Fukushima ◽  
Masashi Fukuchi ◽  
Subaru Fujimura ◽  
Hironori Kaji
Keyword(s):  
Solid State ◽  
Organic Semiconductors ◽  
Solid State Nmr ◽  
Copper Phthalocyanine

scholarly journals Organic Semiconductors for Detection of Ionizing Radiation

2007 ◽  
Vol 1038 ◽  
Author(s):  
Tiffany M.S. Wilson ◽  
Douglas A. Chinn ◽  
Michael J. King ◽  
F. Patrick Doty
Keyword(s):  
Solid State ◽  
Organic Semiconductors ◽  
Large Scale ◽  
Radiation Detection ◽  
Wide Band ◽  
High Ratio ◽  
Dielectric Constants ◽  
Natural Gamma ◽  
Processing Variables ◽  
Solution Cast

AbstractOrganic semiconductors are increasingly common in electronics and sensors, and are now under investigation for a novel type of radiation sensors at Sandia National Laboratories. This class of materials can offer wide band gaps, high resistivities, low dielectric constants, and high dielectric strengths, suggesting they may be suitable for solid-state particle counting detectors. A range of solution cast materials have been evaluated for this application, primarily in the family of poly(p-phenylene vinylene)s, or PPVs. The high ratio of hydrogen to carbon offers neutron sensitivity, while the low Z material provides some natural gamma discrimination. Compared to existing detectors, these materials could potentially offer large-scale radiation detection at a substantially reduced cost.While PPVs hold promise for radiation detection, the mechanical and electrical properties must be optimized and the processing effects understood. Polymers can offer significantly simplified processing compared to the more common crystals used in solid state detection, which can be size limited and fragile. However, organic semiconductors are very sensitive to processing conditions, and mobility can be affected by orders of magnitude by processing variables, without altering any chemistry. Additives can also have dramatic effects on both electrical and mechanical properties. We report on nanoparticle additives that cause an increase in photoresponse of approximately three orders of magnitude as compared to a polymer film without additives. We separately show an order of magnitude increase in photoresponse by exposing the polymer/fullerene composite to sub-bandgap light.Future work will analyze the feasibility of single particle detection and various geometries for optimization. Additional processing variables will also be investigated for further improvement of mobility and reduction of trap density.

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